Safety appliance for steam-boilers.



PATBNTED JUNE 30.v 1903.

J. Busi-3R. I SAFETY APPLIANGE PoR STEAMl BOILE-Rs.

APPLICATION FILED JAN. 9, 1903.

NO MODEL.

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'sure of the engine or boiler; but on an in- 'motive fluid, such as steam.

4steam when its pressure is abnormal and the UNITED STATES ratentea .rene 3o, 190s.

JOHN BEISER, OF MONTREAL, CANADA.

SAFETY APPLIANCE FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 732,333, dated June 30, 1903.

Application filed January 9, 1903.

To a/ZZ whom t may concern: l

Be it known that I, JoHN'BEIsER, a citizen of the United States, and a resident of Montreal, county of Hochelaga, in the Province of Quebec, Dominion of Canada, have invented certain new and useful Improvements in Safety Appliances for vSteam-Boilers; and I do hereby declare that the following is a full, clear, and exact specification of the same.

My invention relates to improvements in safety appliances for steam-boilers, steamengines, and other apparatus for motive fluid; and the primary object that I have in view is the provision of an improved safety mechanism which is extremely simple in construction, cheap of manufacture, and efficient and reliable in operation.

A further object that I have in view is to provide a'safety apparatus in which a valve is kept on its seat bythe energy of a tension device which is adjusted to maintain the valve closed against the normal working prescrease in the pressure this valve is calculated to open'and permit the escape of the A further object that I have in View is 'to provide automatic means for the escape of valve sticks or remains fast on its seat, thus relieving the pressure and promoting the safety of the apparatus.

Afurther object is to provide means whereby the pressure diaphragm or diaphragms may be renewed easily and quickly without the escape of the pressure fluid.

Further objects and advantages of the invention will appear in the course of the subjoined description, and the novelty will be defined by the annexed claims.

To enable others to understand my invention, I have illustrated a practical embodiment thereof in the accompanying drawings, forming a part of this specification, and in which- Figure l is a side elevation of a safety apparatus embodying my invention. Fig. 2 is a vertical longitudinal section thereof. Figs.

3, 4, and 5 are transverse horizontal sectional views on the plane indicated by the dotted lines 3 3, 4 4, ande 5, respectively, of Fig. 2.

serial No. 138,377. (No model.)

suitable casing which is of elongated cylindrical form, said casing consisting of the tubular members A B. The lower member A of said casing is interiorly threaded for a part of its length atthe upper portion thereof, while the other member B of said casing has a male screw-thread which enables said 'member B to be screwed into the member A,

and thereby provides for the extension or contraction of the casing and for the adj ust-- ment of the member B within the lower member A. This lower member A is further provided at its lower portion with an external thread, and it is screwed detachablyinto the foot-piece C, the latter having a pressurepipe C coupled thereto. This foot-piece is provided with an upstanding iiange 2, with a central axial opening 3, and with branch or side passages 4 4, said flange 2 being provided with an internal thread adapted to receive the external thread of the casing member A to couple the parts firmly and detachably together. The member B of the casing projects a suitable distance above the companion memberA, and at its upper end this member B has a stufling-box B' of any suitable construction. The described form'of casing accom modates a valve, (indicated in its entirety by the letter E and having a tubular stem 5,) which is solid at its lower portion at 8, said solid portion constituting the valve which is adapted to rest on a solid portion of the foot member C and to close the axial opening or port 3 therein. The tubular valve-stem 5 passes longitudinally through the members of the casing and the stuiiing-box B thereof, the upper end of said stem extending a suitable distance above said stuffing-box. The lower part of the tubular stem is externally threaded at 6 above the valve member 8, and it is also provided with radial ports 9, located at points between the valve member 8 and the thread 6. (See Fig.'2.) On this threaded lower part of the valve-stem is screwed a cap ICO 7, which is cut away internally to provide an annular chamber 10, which surrounds the ports 9 of the valve-stem and is in communication with the branch passages 4 of the footpiece C. The cap 7 fits snugly within the lower part of the casing memberAand seats itself upon a solid face of the foot-piece C around the branch passages 4 therein. The cap is attached to the valve-stem to move therewith, and this cap 7 with the valve memberS are pressed normally to their seats bya strong coiled spring D,the latter being housed within the casing member A and having its lower end resting on the top face of the valvecap 7. (See Fig. 2.) The upper end of the spring D is seated against the lower edge of the casing member B or against an interposed Washer b, and the tension of this spring may be increased or decreased by rotating the casing member Bin one direction or'the other within the companion casing member A.

The lower part of the casing member A is provided with radial exit-ports 17'at points above the fiange 2 of the foot-piece C, and with these ports communicate the short vertical channels 16, which are formed on the inner face of the casing member A, said channels being in opposing relation to the cap 7 of the valve mechanism.

On the upper protruding end of the valvestem is mounted the diaphragm device,which contributes to the efficiency and safety of the apparatus. The diaphragms are contained within a casing consisting of the parts 2O 21 and the coupling 22, the latter uniting the parts in a way to clamp one or more diaphragms 11 between them. The part 2l of the casing is screwed on the valve-stem, and between this part 21 and the diaphragm is interposed a washer 12 of any suitable material. In the tubular valve-stem 5 is provided a cock 18 of any suitable construction, said cock remaining open normally; but it is adapted to be closed to cut oif the passage of the pressure fluid when it is desired to remove a spent or perforated diaphragm and to replace the same by a fresh imperforate diaphragm.

By reference to Fig. 2 it will be noted that the valve member 8 and the cap 7are held on their seats by the energy of the spring D, thus preventing the escape of the pressure fluid when it is at or below the normal working pressure to which the spring D is adjusted by thecasingmemberB. Itisevidentthatwhen the valve is in working order an abnormal pressure of the fluid will lift the valve and cap and permit the fluid to escape through the passages 16 and the ports 17. It will also be observed that the pressure fluid has free access to the diaphragm-chamber through the branch passages4of the foot-piece, the chamber 10 of the valve-cap, the ports 9, and the longitudinal passage of the tubular stem; but the diaphragm is of such strength as to resist the normal working pressure and to remain in an intact condition when the valve is in working order. It frequently happens, however, that the valve becomes gu m med or stuck on its seat, and unless this condition is observed and remedied in time the apparatus will not work and disastrous results are likely to happen. In my apparatus this contingency is overcome by the provision of the diaphragms having normal exposure to the action of the pressure fluid, and it will be evident that on a failure of the valve to open when the pressure reaches a certain pointin excess of the normal the diaphragm will give way and become perforated on a slight further increase in the pressure, thus automatically establishing a safety-vent.

In Fig. 6 I have illustrated a construction of a hood adapted for use in connection with the valve-stem. This hood consists of a series of arms 15, attached to the diaphragmcasing F and supporting a plate 14, which lies above the diaphragms and in the path of the pressure iiuid which may escape on the rupture of the diaphragm. This plate of the hood is thus exposed to the pressure of the escaping Huid, and it has a tendency to cooperate with the diaphragm to raise the valve when it becomes stuck on its seat.

Having thus fully described the invention, what I claim as new, and desire to secure by Letters Patent, is-

1. Asafety apparatus of the class described comprising a casing, a tubular stem slidable therein and having a valve member, a lrension device for closing said valve member, and a diaphragm mechanism carried by the tubular stem and normally exposed to the pressure fluid.

2. A safety apparatus of the class described comprising a casing, a foot-piece attached to said casin g and having axial and branching passages, a valve-stem having a valve member and radial ports, a cap movable with the valve-stem and establishing communica.- tion between the branch passages of the footpiece and said stem, a tension device for the Valve member and the cap, and a diaphragm mechanism carried by said stem.

3. A safety apparatus of the class described comprising a casing, a foot-piece attached thereto and provided with axial and branch passages, a tubular stem having ports and a valve member, a chambered cap attached to the stem and surrounding the ports thereof, a tension-spring housed within the casing to hold the valve member and the cap normally seated on the foot-piece, and a diaphragm mechanism carried by said stem.

4. Asafety apparatus of the class described comprising a two-part casing having its members coupled adjustably together andv one of said members provided with vent passages and ports, a foot-piece coupled to the lower member of said casing, a valve-stem having ports and a valve member, a chambered cap attached to the stem to surround the ports IOO IIO

therein and to traverse the passages of the l subjected to the pressure fluid, and a hood casing member, a spring seated on the cap disposed over the diaphragm mechanism and and surrounding the stem, said spring being I attached to the valve-stem.

controllable by an adjustment of one casing In testimony that I claim the foregoing I I5 5 member, and a diaphragm mechanism carhereunto set my hand in the'presence ofl two ried by the Valve-stem. subscribing Witnesses.

5. Asafety apparatus of the class described comprising a casing, a valve-stem having a valve member, means for holding the valve Witnesses: Io member normally closed, a diaphragm mech- W. B. S. REDDY,

anism mounted on the stem and normally E. BURKE.

JOHN BEISER. 

